Suggestion: Kingsmarch Treasury Interest

I’e been seeing a lot of people complaining about how difficult it is to keep up with the gold costs and I feel like a simple solution is to give interest to the amount of gold stored in the treasury. It can be 1% or even 0.1% per hour and it will have a huge effect long-term. Maybe it can be an upgrade for the town. This also will invite some strategies and decision making around when to hoard gold and when to spend gold for upgrades.